Air conditioning for extensions and kitchen-diners in Runcorn
Damp North West weather makes the dehumidifying mode of a modern split system genuinely useful for much of the year. An extension in Runcorn with a roof lantern or large glazed doors can overheat quickly on a sunny afternoon.
In Runcorn, a side wall of a single-storey extension is usually the neatest place for the indoor unit. Runcorn is about 7 miles from Warrington and falls within our Cheshire coverage. That includes the WA7 postcode district.
Prices in Runcorn
Our North West England guide price for air conditioning for extensions and kitchen-diners is £1,395–£4,245 per space, VAT included. Labour rates in North West England keep this slightly under the national middle. The biggest variables are the pipe route, access for the outdoor unit and the state of the consumer unit, all of which the survey settles. For reference, the Large single option in Runcorn (one 5–7 kW unit for a large glazed space) usually comes to about £1,945–£2,695.
Single unit
One 3.5–5 kW unit for a medium extension.
Large single
One 5–7 kW unit for a large glazed space.
Twin units
Two indoor units on a multi-split for long or L-shaped spaces.
Guide prices show VAT at 20%. HMRC treats most fixed air conditioners and air-to-air heat pumps installed in homes as energy-saving materials, zero-rated until 31 March 2027 when we supply and fit them. If your installation qualifies, your quote shows 0% VAT and a lower price. Servicing, repairs, cleaning and controls are charged at 20%.
Planning and permissions
Since 29 May 2025, England's permitted development rules allow larger outdoor units (up to 1.5 m³) and no longer require a 1 m gap to the boundary, provided the MCS 020(a) noise check is met. Listed buildings and pitched-roof installs still need permission.
The survey
The free survey is where the real price is set: room measurements, pipe and drain routes, electrical checks and the outdoor unit position, all written into your quote. Surveys in Runcorn cover heat gain, pipe routes, electrics, access and noise to the nearest neighbour, so surprises on the day are rare.
What is included
Included as standard in Runcorn:
- Hidden routes during the build, or neat surface routes after
- Pressure test, vacuum and commissioning
- Handover of the remote or app
- Free survey with glazing and roof heat-gain check
- One or two units sized for the whole space
Nearby
We also cover Widnes (1 mile), Speke (5 miles) and Great Sankey (5 miles). See all services in Runcorn or air conditioning for extensions and kitchen-diners across Cheshire.